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Simple Detection of Primary Cilia by Immunofluorescence
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Microstructure-based modeling of primary cilia mechanics.

Nima Mostafazadeh1, Andrew Resnick2, Y-N Young3

  • 1Department of Biomedical Engineering, University of Illinois Chicago, Chicago, Illinois, USA.

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|April 27, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new model for primary cilia mechanosensing, distinguishing between structural microtubule doublets and the sensing membrane. Findings reveal membrane curvature, not just stretching, activates sensing proteins.

Keywords:
continuum modelingfinite element analysismechanosensingshell theory

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Area of Science:

  • Cell Biology
  • Biophysics
  • Mechanobiology

Background:

  • Primary cilia are crucial mechanosensing organelles.
  • Existing models inadequately distinguish between structural and sensing components.
  • Understanding cilium mechanics is vital for mechanotransduction research.

Purpose of the Study:

  • To develop a microstructure-based model of primary cilia.
  • To separately analyze the roles of microtubule doublets and cilium membrane.
  • To investigate the mechanics of cilium bending and mechanosensing.

Main Methods:

  • Developed an analytical solution for microtubule bending.
  • Utilized finite element simulations for validation.
  • Modeled tip-anchored optical tweezer experiments.
  • Integrated imaging data into the computational model.

Main Results:

  • Microtubule doublets exhibit significant twisting during bending.
  • Cilium mechanical properties are deformation-dependent.
  • Cilium membrane experiences significant local bending stress, not just in-plane stress.
  • Membrane curvature is a key factor in transmembrane protein activation.
  • Imaging-informed models reveal more even microtubule-membrane interaction and localized high curvature.

Conclusions:

  • The distinct roles of microtubule doublets and membrane are critical for accurate mechanosensing models.
  • Membrane curvature, rather than stretching, may be the primary activation mechanism for sensing proteins.
  • This model provides a more nuanced understanding of primary cilia mechanobiology.